Q about Apple's new USB-C dongle released this week

Discussion in 'MacBook Pro' started by MareLuce, Aug 9, 2019.

  1. MareLuce macrumors 6502a

    MareLuce

    Joined:
    Sep 26, 2010
    #1
    This newly upgraded Apple USB-C dongle is great news for frequent travelers who pack a HDMI cable to watch 4k 60Hz content from their iPad Pro or MBP.
    https://9to5mac.com/2019/08/08/new-apple-usb-c-digital-av-multiport-adapter/

    Apple this week has quietly released a new version of its USB-C Digital AV Multiport Adapter. This $69 adapter includes a USB-C port, HDMI port, and USB-A port, with the new version making several notable improvements. [...]

    The new USB-C Digital AV Multiport Adapter adds support for HDMI 2.0, an upgrade from the original model’s HDMI 1.4b. This means you can now drive 4K 3840 x 2160 video at 60Hz from the following Macs and iPads [...]

    I was thrilled till I noticed an article comment of:
    >> So the (first of the current generation) 2016 15" MBP is locked out... quelle surprise.

    As an alumni of the epic "Waiting for Skylake" 1,477 page MacRumors topic where I held my breath that a Skylake MacBook Pro would be announced "any day now" for 3 years running, of course my current MPB is a 2016 15" flavor.

    Any guesses as to why my $4000+ maxed out (2TB, etc...) 2016 MacBook Pro's USB-C port would NOT be supported by that new dongle?

    Here's a picture of same dongle, but in the lightning flavor, connected to a TV in a Hong Kong hotel room.

    [​IMG]

    And before anyone says it, yes I realize I don't need 4k @ 60hz to listen to my fave podcasts :).
    Switching to podcasts from video makes packing and unpacking go faster.
     
  2. jerryk macrumors 601

    Joined:
    Nov 3, 2011
    Location:
    SF Bay Area
    #2
    The first comment in the article you linked implies the hardware in the 2016 MBP can only drive the display at 30Hz when at 4K resolution. This was not an uncommon limitation for 2016, and even occurs today.

    60Hz at 4K requires a lot of bandwidth and graphics decoding power.
     
  3. chabig macrumors 603

    Joined:
    Sep 6, 2002
    #3
    It is supported by the new adapter. You will get 4K output at 30kHz.

    https://www.apple.com/shop/product/MUF82AM/
     
  4. mroy16 macrumors regular

    Joined:
    May 28, 2017
    #4
    If I had to guess, I would say that the older MBPs only support the HDMI 1.4 spec natively. In order to get HDMI for 4K@60, you would need to actively adapt the DisplayPort signal to HDMI 2.0. I believe that the adaptor is passive, so it relies on the native HDMI support from your laptop.
     
  5. MareLuce thread starter macrumors 6502a

    MareLuce

    Joined:
    Sep 26, 2010
    #5
    Correct.

    I meant why would it not support the new capabilities of the USB-C dongle - supporting 4k @ 60Hz.

    PS: You said kHz.. Is it Hz or kHz?

    Thank you @mroy16. That sounds logical.

    Darn. I wish Apple could fix that with a firmware update.
     
  6. smbu2000 macrumors regular

    Joined:
    Oct 19, 2014
    #6
    That's a good point. I didn't think about the adapter being passive and only using the native HDMI from the computer. They might not have updated the native HDMI spec to 2.0

    I've been using a Club3D active usb-c to hdmi 2.0 adapter (supports 4k 60Hz) to connect to my TV since I picked up my 2016 15" MBP in early 2017. The MBP also worked fine on my 4k monitor using a standard usb-c to Displayport cable.

    The hdmi port on my older 15" rMBP was also limited to 30Hz at 4K, which is why I used a similar adapter (active mDP to hdmi adapter) to get 4k 60Hz via the TB2/mDP ports.

    https://www.club-3d.com/en/detail/2349/usb-3.1-type-c-to-hdmit-2.0-uhd-active-adapter/

    If you don't need the usb-a port or the usb-c passthrough (15 MBP has 3 other usb-c ports), then I'd say just get a cable or an active usb-c to hdmi adapter to use for 4k60Hz.
     
  7. playtech1 macrumors member

    Joined:
    Oct 10, 2014
    #7
    I think the lack of native (non-converted displayport) HDMI 2.0 in Intel integrated graphics also explains why even the latest 2019 13 inch MBPs don't support 4k @ 60Hz.
     
  8. joevt macrumors 6502

    Joined:
    Jun 21, 2012
    #8
    Your old Thunderbolt 3 MacBook Pro uses Alpine Ridge which cannot take DisplayPort 1.4 input from AMD graphics. Therefore you are limited to DisplayPort 1.2. The adapter only has two lanes of DisplayPort, so you are limited to 4K 30 Hz.

    For 4K 60Hz with this adapter, you need AMD graphics, and Titan Ridge Thunderbolt 3 controllers to output two lanes of DisplayPort 1.4
    https://forums.macrumors.com/thread...th-2018-ipad-pro.2191964/page-8#post-27614203

    All intel graphics are limited to DisplayPort 1.2.

    For your MacBook Pro, you need a four lane DisplayPort 1.4 to HDMI 2.0 adapter.
    https://www.club-3d.com/en/detail/2442/displayport_1.4_to_hdmi_2.0b_hdr/
    DisplayPort 1.4 is required for HDR but you should be able to get at least 4K 60Hz without HDR.

    I don't know if Alpine Ridge is limited to DisplayPort 1.2, or if it's just limited to HBR2 speeds (5.4 Gbps per lane). If the latter, then maybe you can get DisplayPort 1.4 HDR from your AMD graphics through the Alpine Ridge since only 5.4 Gbps is required.
     

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7 August 9, 2019